Многие любят гулять в парке вечером.

Многие means many people in this sentence.

Literally, многие is a plural form meaning many or many ones, and in Russian it can stand on its own when the noun is understood from context. So:

• Многие любят гулять... = Many people like to walk...

Russian often leaves out a noun if it is obvious. English usually needs to say many people, but Russian can just say многие.

You could also say:

• Многие люди любят гулять в парке вечером.

That is more explicit, but люди is not necessary here.

Многие is in the nominative plural because it is the subject of the sentence.

The sentence structure is:

• Многие = subject
• любят = verb
• гулять = infinitive
• в парке вечером = where/when

Since many people are the ones doing the liking, многие must be in the nominative.

Because the subject многие is plural.

Любят is the 3rd person plural form of любить:

• я люблю = I love / like
• ты любишь = you like
• он/она любит = he/she likes
• они любят = they like

Since многие means many people, the verb must also be plural:

• Многие любят... = Many people like...

Because after любить Russian often uses an infinitive to express liking to do something.

So:

• любить гулять = to like walking / to like to walk

This is very natural in Russian. Compare:

• Я люблю читать. = I like reading.
• Он любит плавать. = He likes swimming.
• Многие любят гулять. = Many people like walking.

English may use either like to walk or like walking. Russian normally uses the infinitive here.

Because гулять is the imperfective verb, and after любить Russian usually prefers the imperfective when talking about a general habit or activity.

Here the meaning is general:

• Many people like walking in the park in the evening.

This is not about one completed walk. It is about the activity in general, so гулять is the natural choice.

Very roughly:

• гулять = to walk / to stroll / to spend time walking, as an ongoing or habitual activity
• погулять = to take a walk, often with a sense of a single outing or a completed event

So:

• люблю гулять = I like walking
• люблю погулять can exist, but it has a more colloquial feel and often suggests I like to go out for a walk now and then

In this sentence, гулять is the standard choice.

Because в парке means in the park, indicating location, while в парк would indicate motion toward the park.

Russian uses different cases after в depending on meaning:

• в + accusative = into / to
• в + prepositional = in / inside / at

Here nobody is going to the park. The sentence says they like walking in the park, so Russian uses the prepositional case:

• в парке

Compare:

• Они идут в парк. = They are going to the park.
• Они гуляют в парке. = They are walking in the park.

Парке is the prepositional singular form of парк.

The preposition в takes the prepositional case when it means in or at a place. So:

• парк → dictionary form, nominative singular
• в парке → prepositional singular

This is a regular pattern for many masculine nouns:

• в доме = in the house
• в саду = in the garden
• в музее = in the museum
• в парке = in the park

So the ending changes because the noun is in the prepositional case.

Because Russian often uses the instrumental case to express time when, especially for parts of the day.

So:

• утром = in the morning
• днём = in the daytime / during the day
• вечером = in the evening
• ночью = at night

This is very common and natural. English uses prepositions like in or at, but Russian often does not need one here.

So:

• в парке вечером = in the park in the evening

Yes. Вечером is the instrumental singular of вечер.

This is one of the common ways Russian expresses time. The instrumental here works adverbially, meaning something like during the evening or in the evening.

You do not need to translate the case literally. The main thing to remember is that Russian often uses bare case forms for time expressions where English needs a preposition.

Grammatically, yes, because любить can mean to love or to like, depending on context.

But in this sentence, the most natural English translation is usually:

• Many people like to walk in the park in the evening.

Using love in English sounds stronger. Russian любить + infinitive often corresponds to ordinary English like doing something, not necessarily strong emotional love.

So while love is possible, like is usually the better choice here.

The sentence has a very neutral, natural word order:

• Многие любят гулять в парке вечером.

This is basically:

• subject + verb + infinitive + place + time

Russian word order is flexible, so you can move things around for emphasis. For example:

• Вечером многие любят гулять в парке. = In the evening, many people like walking in the park.
• В парке многие любят гулять вечером. = In the park, many people like to walk in the evening.

The basic meaning stays similar, but the emphasis changes. The original order is a normal, neutral way to say it.

Yes, that is possible, and it also means Many people like to walk in the park in the evening.

But there is a difference in style:

• Многие любят... = many people, many of them
• Много людей любят... = a lot of people

Both are correct. Многие is often a little more compact and elegant. Много людей is also common, but slightly more explicit.

A learner should understand both.

It can be broader than just walk.

Гулять often means:

• to walk
• to stroll
• to go for a walk
• to spend time outside for pleasure

So in this sentence, it could mean simply walk in the park, but it also carries the idea of leisurely spending time there.

That is why translations like these can all work depending on context:

• Many people like to walk in the park in the evening.
• Many people like strolling in the park in the evening.
• Many people like spending time in the park in the evening.

The first one is the safest and most standard translation.